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Method for recovering lead

A lead recovery and lead paste technology, which is applied in the field of lead recovery from lead-containing waste, can solve the problems of difficult reduction of lead sulfate, air pollution, corrosion of refractory materials, etc., and achieve the effects of low pollution, low energy consumption and cost reduction

Inactive Publication Date: 2012-07-11
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the process of carbon reduction, lead dioxide is easy to reduce, and it is reduced to metallic lead at about 1200°C, but lead sulfate is difficult to reduce, and it needs to be reduced to metallic lead at about 1350°C, which leads to the corrosion of refractory materials in the smelting furnace by lead oxide
During this smelting process, sulfate radicals are converted into sulfur dioxide and released into the air, causing serious air pollution

Method used

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  • Method for recovering lead
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Embodiment 1 prepares lead citrate with PbO

[0064] Lead oxide is processed with citric acid fermented liquid, is 1:1 to add citric acid fermented liquid by the mol ratio of lead oxide and citric acid, in the citric acid fermented liquid, citric acid content 101g / L, miscellaneous acid content 3.8%; °C until the reaction is complete. After the reaction was complete, precipitated for 15 minutes and then filtered. The collected solids were washed with distilled water, filtered, and dried at 80 °C. The filtrate was analyzed and the results are shown in Table 2.

[0065] The performance of Pb is similar to that of PbO. The above conditions and results for lead oxide apply to lead, yielding essentially the same results.

Embodiment 2

[0066] Example 2 with PbO 2 Preparation of lead citrate

[0067] Lead dioxide is processed with citric acid fermented liquid, adds citric acid fermented liquid by the mol ratio 1:4 of lead dioxide and citric acid, and in the citric acid fermented liquid, citric acid content is 101g / L, and miscellaneous acid content is 3.8%, Add 27.5% hydrogen peroxide solution according to the molar ratio of lead dioxide to hydrogen peroxide 1:2, and add appropriate amount of water according to the solid-liquid ratio of 1:50; treat at a temperature of 30°C until the reaction is complete. After the reaction was complete, precipitated for 15 minutes and then filtered. The collected solids were washed with distilled water, filtered, and dried at 80°C. The filtrate was analyzed and the results are shown in Table 2.

Embodiment 3

[0068] Example 3 Using PbSO 4 Preparation of lead citrate

[0069] Treat lead sulfate with citric acid fermentation broth, add citric acid fermentation broth according to the molar ratio of lead sulfate to citric acid 1:2, the content of citric acid in the citric acid fermentation broth is 101g / L, and the content of heteroacids is 3.8%. The molar ratio of lead to sodium citrate is 1:1, add sodium citrate solid, according to the solid-liquid ratio of 1:40, add an appropriate amount of water; treat at a temperature of 20°C until the reaction is complete. After the reaction was complete, precipitated for 15 minutes and then filtered. The collected solids were washed with distilled water, filtered, and dried at 80°C. The filtrate was analyzed and the results are shown in Table 2.

[0070] The recovery effects of Examples 1-3 are shown in Table 2.

[0071] Table 2 Lead concentration and recovery rate in the filtrate

[0072]

[0073] Visible, with citric acid instead of pur...

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Abstract

The invention discloses a method for recovering lead, in particular a method for recovering lead from a waste lead battery. The method comprises the following steps of: mixing lead wastes containing PbSO4, PbO2, PbO and Pb and citric acid fermentation liquor and reacting to form lead citrate; and separating the lead citrate from an aqueous solution, and converting the lead citrate into the lead or lead oxide. By the method, the problems that SO2 is discharged and the lead is volatilized at high temperature in a pyrometallurgical process for lead paste are solved; and the lead wastes are directly treated by the citric acid fermentation liquor, so that cost and pollution are reduced, and particularly the lead can be recovered from the waste battery in a more effective and energy-saving mode.

Description

technical field [0001] The invention relates to a waste recycling method, in particular to a method for recycling lead from lead-containing waste. Background technique [0002] More than 50% of the world's lead production is from recycled lead. It is believed that close to 90% of the lead in lead batteries is recycled. Lead battery recycling involves processing lead battery paste to separate lead from other battery components. Lead recovery involves physical separation techniques as well as chemical techniques such as hydrometallurgy, electrowinning and pyrometallurgy. [0003] Recycling secondary lead is an important part of the sustainable development strategy of the lead industry. Recycling secondary lead can make lead metal enter a virtuous cycle of production-consumption-regeneration, make full use of renewable resources (lead waste), reduce the amount of mining of primary resources (lead ore), and extend its mining period. Recycling lead resources can protect the e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B13/00C22B3/18
CPCY02P10/20
Inventor 郑涛陈怡露蒋娟华冯迟朱孟峰
Owner NANJING UNIV OF TECH
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